I only care about Lemmy
I find myself doing a lot more commenting than original posting and so Lemmy is a much better choice for me in the way I like to use social media. I do have a mastodon account, but it’s not something I go on super often. In fact, my launcher has swipe gestures and so I can just flick one finger to the right on my home screen and Thunder opens so that I can browse the latest stuff on Lemmy but I never did that for Mastodon.
I am a big fan of Thunder, primarily, because it reminds me a lot of a Reddit app that I used to use called Red Reader. And I helped the developers implement screen reader accessibility from very near the beginning. And so, at least to my knowledge, it is one of the most accessible, lemmy clients.